Flexible display device

ABSTRACT

The present application provides a flexible display device. A housing includes a first housing and a second housing, which are relatively slidably arranged. A first end of a flexible display screen is connected to the first support member of the first housing. A second end of the flexible display screen bypasses the second support member of the second housing and is connected to a stretching mechanism in the housing. A packaging member is disposed on at least one first side plate of the second housing and covers at least a portion of an edge of the flexible display screen. The present application prevents dust from intruding into a bottom of the flexible display.

FIELD OF INVENTION

The present application is related to the field of display technology,and specifically, to a flexible display device.

BACKGROUND OF INVENTION

Currently, flexible display devices mostly use two relatively slidablehousings to realize a large-screen and a small-screen display of aflexible display screen. However, when the flexible display devices areretracted and pulled out of their housings, dust and other particles caneasily intrude into bottoms of the flexible display screens, causingdamage to the flexible display screens.

Therefore, a technical problem that dust is easy to intrude into thecurrent flexible display devices needs to be improved.

SUMMARY OF INVENTION

The present application provides a flexible display device to alleviatea technical problem that dust is easy to intrude into a current flexibledisplay device.

In order to solve the above problem, the present application providestechnical solutions as follows.

A flexible display device provided by the present application includes:

-   -   a housing including a first housing and a second housing, which        are relatively slidably arranged, wherein the first housing        includes a first support member, and the second housing includes        a second support member;    -   a flexible display screen, wherein a first end of the flexible        display screen is connected to the first support member;    -   a stretching mechanism disposed in the housing, wherein a second        end of the flexible display screen bypasses the second support        member and is connected to the stretching mechanism; and    -   a packaging member disposed on at least one first side plate of        the second housing, wherein a first packaging surface of the        packaging member covers at least a portion of an edge of the        flexible display screen.

When the flexible display screen is in a first state, the first housingand the second housing slide in directions away from each other, and thestretching mechanism pulls at least a portion of the flexible displayscreen out of the housing. When the flexible display screen is in asecond state, the first housing and the second housing slide indirections approaching each other, and the stretching mechanism retractsat least a portion of the flexible display screen into the housing.

In the flexible display device of the present application, the packagingmember includes a first packaging portion and a second packagingportion, which are connected to each other. The first packaging portionis disposed on an outer wall of the first side plate. The secondpackaging portion is disposed on a top surface of the first side platethrough the first packaging surface.

In the flexible display device of the present application, a notch isdefined at an intersection of the outer wall and the top surface of thefirst side plate. The first packaging portion is disposed in the notch.

In the flexible display device of the present application, a thicknessof the first packaging portion is equal to a depth of the notch.

In the flexible display device of the present application, the packagingmember and the first side plate are formed separately.

In the flexible display device of the present application, a length ofthe packaging member is greater than or equal to a length of the secondsupport member.

In the flexible display device of the present application, a second sideplate of the first housing includes a side plate body and a firstextension portion. The side plate body is parallel to the first sideplate. The first extension portion covers the packaging member. Thepackaging member includes a second packaging surface away from a topsurface of the first side plate. A first extension surface of the firstextension portion is in contact with the second packaging surface.

In the flexible display device of the present application, of the firstextension surface and the second packaging surface, one is formed withat least one protrusion, and the other one is defined with at least onegroove, which has a same number as the protrusion. The protrusion andthe groove fit each other.

In the flexible display device of the present application, a shape ofthe protrusion includes at least one of a semicircle, a triangle, or arectangle.

In the flexible display device of the present application, a firstblocking member is further provided between the first extension surfaceand the second packaging surface. The first blocking member includes abrush or a foam.

In the flexible display device of the present application, the secondside plate further includes a second extension portion. The secondextension portion is connected to and perpendicular to the firstextension portion. The side plate body, the first extension portion, andthe second extension portion form an accommodation cavity. The packagingmember is embedded in the accommodation cavity.

In the flexible display device of the present application, the secondextension portion includes a second extension surface adjacent to anupper surface the flexible display screen. A distance between the secondextension surface and the upper surface of the flexible display screenis less than or equal to 0.5 millimeters.

In the flexible display device of the present application, the secondextension portion includes a second extension surface adjacent to anupper surface the flexible display screen. A second blocking member isfurther provided between the second extension surface and the uppersurface of the flexible display screen. The second blocking memberincludes a brush or a foam.

In the flexible display device of the present application, the firsthousing includes a first bottom plate, and the second housing includes asecond bottom plate. A distance between a bottom surface of the firstbottom plate and a bottom surface of the second bottom plate is lessthan 1.5 millimeters.

In the flexible display device of the present application, the firsthousing includes a first bottom plate, and the second housing includes asecond bottom plate. A distance between a bottom surface of the firstbottom plate and a bottom surface of the second bottom plate is lessthan 0.5 millimeters.

In the flexible display device of the present application, inner wallsof two first side plates arranged oppositely in the second housing aredefined with sliding grooves. Two sides of the first support member aremovably disposed in the sliding grooves.

In the flexible display device of the present application, of the firstsupport member and the second support member, a surface of one isdefined with a plurality of grooves arranged at intervals, a surface ofthe other one is provided with a plurality of comb teeth arranged atintervals. Each of the plurality of comb teeth is correspondinglyembedded in each of the plurality of grooves.

In the flexible display device of the present application, across-section of each of the plurality of grooves includes an invertedtrapezoid, and a cross-section of each of the plurality of comb teethincludes a regular trapezoid.

In the flexible display device of the present application, the flexibledisplay device further includes a guide member disposed in the housing.A second end of the flexible display screen bypasses the guide memberand is connected to the stretching mechanism.

In the flexible display device of the present application, the guidemember includes a roller. Inner walls of two first side plates arrangedoppositely in the second housing or two end surfaces of the roller areprovided with a circular protrusion, another one is defined with acircular groove. The circular protrusion is embedded in the circulargroove.

Beneficial effects of the present application are as follows. Theflexible display device provided by the present application includes thehousing, the flexible display screen, the stretching mechanism, and thepackaging member. The housing includes the first housing and the secondhousing, which are relatively slidably arranged. The first housingincludes the first support member. The second housing includes thesecond support member. The first end of the flexible display screen isconnected to the first support member. The stretching mechanism isdisposed in the housing. The second end of the flexible display screenbypasses the second support member and is connected to the stretchingmechanism. The packaging member is disposed on at least one first sideplate of the second housing. The first packaging surface of thepackaging member covers at least a portion of the edge of the flexibledisplay screen. When the flexible display screen is in the first state,the first housing and the second housing slide in directions away fromeach other, and the stretching mechanism pulls at least a portion of theflexible display screen out of the housing. When the flexible displayscreen is in the second state, the first housing and the second housingslide in directions approaching each other, and the stretching mechanismretracts at least a portion of the flexible display screen into thehousing. In the present application, when the flexible display screen ispulled out and retracted into the housing, the packaging member packagesa gap between the second support member and the flexible display screen,which prevents the edge of the flexible display screen from being liftedor prevents dust particles from intruding into a bottom of the flexibledisplay screen, thereby extending a lifespan of the flexible displaydevice.

DESCRIPTION OF DRAWINGS

In order to describe technical solutions in the present applicationclearly, drawings to be used in the description of embodiments will bedescribed briefly below. Obviously, drawings described below are onlyfor some embodiments of the present application, and other drawings canbe obtained by those skilled in the art based on these drawings withoutcreative efforts.

FIG. 1 is an exploded schematic diagram of a flexible display deviceprovided by an embodiment of the present application.

FIG. 2 is an enlarged schematic diagram of a structure at A in FIG. 1 .

FIG. 3 is a schematic diagram of the structure in FIG. 2 viewed fromanother angle.

FIG. 4 is a first exploded schematic diagram of the flexible displaydevice provided by an embodiment of the present application in a firststate.

FIG. 5 is a second exploded schematic diagram of the flexible displaydevice provided by an embodiment of the present application in the firststate.

FIG. 6 is a first exploded schematic diagram of the flexible displaydevice provided by an embodiment of the present application in a secondstate.

FIG. 7 is a second exploded schematic diagram of the flexible displaydevice provided by an embodiment of the present application in thesecond state.

FIG. 8 is a front view of a structural schematic diagram of the flexibledisplay device provided by an embodiment of the present application inthe first state.

FIG. 9 is a side view of a structural schematic diagram of the flexibledisplay device provided by an embodiment of the present application inthe first state.

FIG. 10 is a front view of a structural schematic diagram of theflexible display device provided by an embodiment of the presentapplication in the second state.

FIG. 11 is a side view of a structural schematic diagram of the flexibledisplay device provided by an embodiment of the present application inthe second state.

FIG. 12 is a cross-sectional schematic diagram of grooves of a firststretching member and comb teeth of a support member, which fit eachother in the flexible display device provided by an embodiment of thepresent application.

FIGS. 13-34 are respectively a first to a twenty-second cross-sectionalschematic diagrams of structures at C in FIG. 8 .

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Examples are described below with reference to the appended drawings,and the drawings illustrate particular embodiments in which the presentapplication may be practiced. Directional terms mentioned in the presentapplication, such as upper, lower, front, rear, left, right, in, out,side, etc., only refer to directions in the accompanying drawings. Thus,the adoption of directional terms is used to describe and understand thepresent application, but not to limit the present application. In thedrawings, units of similar structures are using the same numeral torepresent.

The present application provides a flexible display device to alleviatea technical problem that dust is easy to intrude into a current flexibledisplay device.

FIG. 1 is an exploded schematic diagram of a flexible display deviceprovided by an embodiment of the present application. FIGS. 4 and 5 areexploded schematic diagram of the flexible display device provided by anembodiment of the present application in a first state. FIGS. 6 and 7are exploded schematic diagram of the flexible display device providedby an embodiment of the present application in a second state. Withreference to FIGS. 1, 4, 5, 6, and 7 , the flexible display deviceprovided by the present application includes a housing 10, a flexibledisplay screen 20, stretching mechanism 30, and packaging member 40.

The housing 10 includes a first housing 11 and a second housing 12,which are relatively slidably arranged. The first housing 11 includes afirst support member 110. The second housing 12 includes a secondsupport member 120.

A first end 21 of the flexible display screen 20 is connected to thefirst support member 110.

The stretching mechanism 30 is disposed in the housing 10. A second end22 of the flexible display screen 20 bypasses the second support member120 and is connected to the stretching mechanism 30.

The packaging member 40 is disposed on at least one first side plate 122of the second housing 12. A first packaging surface of the packagingmember 40 covers at least a portion of an edge of the flexible displayscreen 20.

When the flexible display screen 20 is in the first state, the firsthousing 11 and the second housing 12 slide in directions away from eachother, and the stretching mechanism 30 pulls at least a portion of theflexible display screen 20 out of the housing 10. When the flexibledisplay screen 20 is in the second state, the first housing 11 and thesecond housing 12 slide in directions approaching each other, and thestretching mechanism 30 retracts at least a portion of the flexibledisplay screen 20 into the housing 10.

The housing 10 includes the first housing 11 and the second housing 12,which can slide relatively. The first housing 11 includes a first bottomplate 111 and two oppositely disposed second side plates 112. The secondhousing 12 includes a second bottom plate 121 and two oppositelydisposed first side plates 122. The first housing 11 and the secondhousing 12 can relatively move along a length direction of common sidesof the first bottom plate 111 and the second side plates 112.Specifically, the second housing 12 can be embedded in the first housing11, or the first housing 11 can be embedded in the second housing 12.Both of these arrangements are possible. This embodiment takes thesecond housing 12 being embedded in the first housing 11 as an examplefor description. After them being embedded, the first bottom plate 111is parallel to the second bottom plate 121, and the second side plates112 are parallel to the first side plates 122.

The first housing 11 includes the first support member 110. The secondhousing 12 includes the second support member 120. When the firsthousing 11 and the second housing 12 slide relatively, the first supportmember 110 and the second support member 120 slide relativelyaccordingly.

The flexible display screen 20 is usually an organic light-emittingdiode (OLED) display having foldable and rollable functions. The firstend 21 of the flexible display screen 20 is fixed on an upper surface ofthe first support member 110. The second end 22 of the flexible displayscreen 20 bypasses the second support member 120 and is connected to thestretching mechanism 30. The first end 21 can be fixed on the uppersurface of the first support member 110. An upper surface of theflexible display screen 20 can display images. The second end 22 isconnected to the stretching mechanism 30. The second end 22 is notconfigured to display images. A region between the first end 21 and thesecond end 22 can display images. During a winding process, the regioncan be positioned outside or inside the housing 10 according to a degreeof winding.

According to different requirements of users, the flexible displayscreen 20 can be in different states. The first state refers to alarge-screen display state, and the second state refers to asmall-screen display state. In the two states, the first end 21 of theflexible display screen 20 is positioned on an outer surface of theflexible display device and can be configured to display images.

When the flexible display screen 20 is in the first state, as shown inFIGS. 8 and 9 , the first housing 11 and the second housing 12 slide indirections away from each other. The first support member 110 and thesecond support member 120 also gradually move away from each other. Thestretching mechanism 30 pulls at least a portion of the flexible displayscreen 20 out of the housing 10. The portion can be configured todisplay images. After the portion is pulled out of the housing 10, thefirst end 21 and the portion pulled out of the housing 10 display imagestogether. When all of a stretchable region of the flexible displayscreen 20 is pulled out of the housing 10, the flexible display devicecan realize a large-screen display. This is when a display area of theflexible display screen 20 is a maximum display area.

When the flexible display screen 20 is in the second state, as shown inFIGS. 10 and 11 , the first housing 11 and the second housing 12 slidein directions approaching each other. The first support member 110 andthe second support member 120 also gradually brought closer to eachother. The stretching mechanism 30 retracts at least a portion of theflexible display screen 20 into the housing 10. Meanwhile, the first end21 and a portion of a region not retracted into the housing 10 displayimages together. When the stretchable region of the flexible displayscreen 20 is all retracted into the housing 10, the flexible displaydevice can realize a small-screen display, and a display area of theflexible display screen 20 is an initial display area at this time.

Through the above-mentioned configurations, the flexible display devicecan be switched between the first state and the second state. When theflexible display screen 20 needs the large-screen display, a requireddisplay region is pulled out of the housing 10, so that the display areaof the flexible display device is increased, and a displayed content canbe more abundant. When the flexible display screen 20 needs thesmall-screen display, an unrequired display region is retracted into thehousing 10, so that the flexible display device has a smaller size andoccupies a smaller space, making it convenient to carry. The flexibledisplay device of the present application can flexibly control thedisplay area of the flexible display screen 20, and the housing 10 canprotect the internal flexible display screen 20 from damage.

During a relative sliding process of the first housing 11 and the secondhousing 12, the first end 21 of the flexible display screen 20 is alwaysfixed to the first support member 110, while the second end 22 onlybypasses the second support member 120 and is fixed to the stretchingmechanism 30. A portion of the flexible display screen 20 on the secondsupport member 120 is not attached to the second support member 120, andthe second support member 120 can only provide a support function, soparticles such as dust intrude into a gap between the two, causingdamage to the flexible display screen 20.

FIGS. 13-34 are respectively a first to a twenty-second cross-sectionalschematic diagrams of structures at C in FIG. 8 . As shown in FIGS. 8 ,and 13-34, the packaging member 40 is disposed on at least one firstside plate 122. A first packaging surface of the packaging member 40covers at least a portion of an edge of the flexible display screen 20.During processes of the flexible display screen 20 being pulled out ofand retracted into the housing 10, the packaging member 40 covers anedge region of the upper surface of the flexible display screen 20through the first packaging surface, and plays a role of packaging thegap between the flexible display screen 20 and the second support member120. This makes it difficult for dust to intrude, thereby protecting theflexible display screen 20 and extending a lifespan of the flexibledisplay device.

The packaging member 40 can be separately or integrally formed with thefirst side plate 122. When the packaging member 40 is formed separately,the two are fixed by hot melting or glue attachment. When the packagingmember 40 is formed integrally, an inner wall of the first side plate122 is directly formed with protrusions, and the protrusions constitutethe packaging member 40.

In an embodiment, a length of the packaging member 40 is greater than orequal to a length of the second support member 120, and the lengthsrefer to lengths along a long side direction of the first side plate122. This configuration can make all edges of the portion of theflexible display screen 20 covered by the first packaging surface of thepackaging member 40 when the flexible display screen 20 is on the secondsupport member 120, and there is no uncovered portions, so a dustproofeffect is better.

The packaging member 40 is disposed on at least one first side plate122, which means that the packaging member 40 can be disposed on oneside only or on two opposite sides. When the first side plates 122 ontwo opposite sides are provided with the packaging members 40, thedustproof effect is the best. An embodiment of the present applicationtakes two opposite first side plate 122 being provided with thepackaging members 40 as an example for description, but only one firstside plate 122 provided with the packaging member 40 can also achieve acertain dustproof effect.

In an embodiment, the packaging member 40 includes a first packagingportion 41 and a second packaging portion 42, which are connected toeach other. The first packaging portion 41 is disposed on an outer wallof the first side plate 122. The second packaging portion 42 is disposedon a top surface of the first side plate 122 through the first packagingsurface. By disposing the packaging member 40 on the first side plate122, the first packaging portion 41 of the packaging member 40 is fixedon the outer wall of the first side plate 122, and the second packagingportion 42 is fixed on the top surface of the first side plate 122. Agap between the inner wall of the first side plate 122 and a side of theflexible display screen 20 is sealed by the packaging member 40, and thesecond packaging portion 42 overlaps at least a portion of the edge ofthe flexible display screen 20, which can limit them in an up-downdirection. As such, the packaging member 40 can prevent impurities suchas dust from intruding into a bottom of the flexible display screen 20,thereby preventing the flexible display screen 20 from damage when auser presses it, and preventing the flexible display screen 20 and thesecond support member 120 from separating as a result of faultyoperation of the user. Therefore, a sealing performance of the flexibledisplay device is increased, and the lifespan thereof is extended.

In the packaging member 40, the first packaging portion 41 is fixed tothe outer wall of the first side plate 122. In order to save space, anotch is defined at an intersection of the outer wall and the topsurface of the first side plate 122. A cross-section of the notch isrectangular. The first packaging portion 41 is disposed in the notch. Athickness of the first packaging portion 41 is equal to a depth of thenotch, so an outer wall of the first packaging portion 41 can be flushwith the outer wall of the first side plate 122. When the second housing12 is embedded in the first housing 11, there is no need to leave moredistance between the first side plate 122 and the second side plate 112to accommodate the packaging member 40, so that the flexible displaydevice has a smaller overall size and occupies a smaller space.

In an embodiment, as shown in FIGS. 13-22 , the second side plate 112includes a side plate body 1121 and a first extension portion 1122. Theside plate body 1121 is parallel to the first side plate 122. The firstextension portion 1122 covers the packaging member 40. The packagingmember 40 includes a second packaging surface away from the top surfaceof the first side plate 122. A first extension surface of the firstextension portion 1122 is in contact with the second packaging surface.By arranging the second side plate 112 of the first housing 11 as astructure surrounding the packaging member 40, which further packagestwo opposite sides of the flexible display screen 20 during the slidingprocess of the second support member 120, the edge of the flexibledisplay screen 20 is prevented from being lifted, or dust particles areprevented from intruding into the bottom of the flexible display screen,resulting in a better packaging effect.

In an embodiment, as shown in FIG. 14 , a first blocking member 80 isfurther provided between the first extension surface and the secondpackaging surface. The first blocking member 80 includes a soft materialwith high volumetric shrinkage such as a brush or a foam. A possibilityof external dust particles intruding through the gap between the secondside plate 112 and the packaging member 40 can be further reduced bydisposing the first blocking member 80, thereby increasing the packagingeffect.

In an embodiment, as shown in FIGS. 15-22 , of the first extensionsurface and the second packaging surface, one is formed with at leastone protrusion 101, and the other one is defined with at least onegroove 102, which has a same number as the protrusion 101. Theprotrusion 101 and the groove 102 fit each other. A shape of theprotrusion 101 includes at least one of a semicircle, a triangle, or arectangle. The packaging member 40 and the second side plate 112 can beintegrated more tightly by a way that the protrusion 101 and the groove102 fit each other. The possibility of external dust particles intrudingthrough the gap between the second side plate 112 and the packagingmember 40 can be further reduced, thereby increasing the packagingeffect.

In an embodiment, as shown in FIGS. 23-34 , in addition to the sideplate body 1121 and the first extension portion 1122, the second sideplate 112 further includes a second extension portion 1123. The secondextension portion 1123 is connected to and perpendicular to the firstextension portion 1122. The side plate body 1121, the first extensionportion 1122, and the second extension portion 1123 form anaccommodation cavity. The packaging member 40 is embedded in theaccommodation cavity. A packaging of the packaging member 40 is realizedby disposing the second extension portion 1123. Meanwhile, a pressingfunction of the flexible display screen 20 is increased to make itdifficult to be lifted upward. The second side plate 112 and thepackaging member 40 fit each other to provide packaging on the edges oftwo opposite sides of the flexible display screen 20 during the slidingprocess, resulting in a better packaging effect.

In an embodiment, the second extension portion 1123 includes a secondextension surface adjacent to an upper surface the flexible displayscreen 20. A distance between the second extension surface and the uppersurface of the flexible display screen 20 is less than or equal to 0.5millimeters. The distance can ensure that dust is not easy to intrude.

In an embodiment, as shown in FIG. 24 , the first blocking member 80 isfurther provided between the first extension surface of the firstextension portion 1122 and the second packaging surface. The firstblocking member 80 includes the soft material with high volumetricshrinkage such as the brush or the foam. The possibility of externaldust particles intruding through the gap between the second side plate112 and the packaging member 40 can be further reduced by disposing thefirst blocking member 80, thereby increasing the packaging effect.

In an embodiment, as shown in FIG. 25 , a second blocking member 90 isfurther provided between the second extension surface of the secondextension portion 1123 and the upper surface of the flexible displayscreen 20. The second blocking member 90 includes the soft material withhigh volumetric shrinkage such as the brush or the foam. A possibilityof external dust particles intruding through the gap between the secondside plate 112 and the flexible display screen 20 can be further reducedby disposing the second blocking member 90, thereby increasing thepackaging effect.

In an embodiment, as shown in FIG. 26 , the first blocking member 80 isfurther provided between the first extension surface of the firstextension portion 1122 and the second packaging surface, and the secondblocking member 90 is further provided between the second extensionsurface of the second extension portion 1123 and the upper surface ofthe flexible display screen 20. The first blocking member 80 and thesecond blocking member 90 both include the soft material with highvolumetric shrinkage such as the brush or the foam. The possibilities ofexternal dust particles intruding through the gap between the secondside plate 112 and the packaging member 40 and the gap between thesecond side plate 112 and the flexible display screen 20 can be furtherreduced by disposing the first blocking member 80 and the secondblocking member 90, thereby increasing the packaging effect.

In an embodiment, as shown in FIGS. 27-34 , of the first extensionsurface and the second packaging surface, one is formed with at leastone protrusion 101, and the other one is defined with at least onegroove 102, which has a same number as the protrusion 101. Theprotrusion 101 and the groove 102 fit each other. A shape of theprotrusion 101 includes at least one of a semicircle, a triangle, or arectangle. The packaging member 40 and the second side plate 112 can beintegrated more tightly by a way that the protrusion 101 and the groove102 fit each other. The possibility of external dust particles intrudingthrough the gap between the second side plate 112 and the packagingmember 40 can be further reduced, thereby increasing the packagingeffect.

In the flexible display device of the present application, because thesecond housing 12 is embedded in the first housing 11, the first housing11 and the second housing 12 are interconnected in their thicknessdirections, and the first housing 11 covers the second bottom plate 121of the second housing 12 and two first side plates 122, an overlappingregion between the second housing 12 and the first housing 11 isincreased and decreased through different relative sliding directions ofthe first housing 11 and the second housing 12 when the first housing 11is in the sliding process. A distance between a bottom surface of thefirst bottom plate 111 and a bottom surface of the second bottom plate112 is less than 1.5 millimeters, so as to ensure an overall pleasingappearance of the flexible display device. A distance between the bottomsurface of the first bottom plate 111 and the bottom surface of thesecond bottom plate 112 is less than or equal to 0.5 millimeters, so asto provide a complete appearance and a dustproof packaging function fora back of the flexible display device.

As shown in FIGS. 1, 4, 5, 6, and 7 , the stretching mechanism 30includes a first stretching member 31, a second stretching member 32,and a transmission assembly 33. The first stretching member 31 ispositioned above the second stretching member 32. The first stretchingmember 31 is fixed to the first support member 110. The transmissionassembly 33 is fixed to the second housing 12. The second stretchingmember 32 and the transmission assembly 33 are movably disposed. Whenthe transmission assembly 33 is in operation, it can drive the firststretching member 31 and the second stretching member 32 to move in theopposite direction along a stretching direction at the same time. Thestretching direction is a direction parallel to long sides of the firstside plate 121 and the second side plate 112, which refers to ahorizontal direction in FIG. 1 . Depending on states of the flexibledisplay screen 20, the transmission assembly 33 drives the firststretching member 31 and the second stretching member 32 to move indifferent directions, the two can be gradually brought closer to eachother along the stretching direction, or the two can be gradually movedaway along the stretching direction. In addition, because the firststretching member 31 is fixed to the first housing 11, movements of thefirst housing 11 are driven by the first stretching member 31.

In the second housing 12, two first side plates 122 can be integrallyformed with the second bottom plate 121, or they can be formedseparately and followed by disposed on the second bottom plate 121. Inthis embodiment, they are formed separately. Inner walls of the twofirst side plates 122 are defined with snap grooves, and two oppositesides of the second support member 120 are fixedly installed in the twosnap grooves. The second support member 120 and the two first sideplates 122 cannot move or rotate relative to each other.

The first end 21 of the flexible display screen 20 is fixed to the firstsupport member 110. The second end 22 bypasses the second support member120 and is fixed to the second stretching member 32 in the stretchingmechanism 30. The transmission assembly 33 controls a relative slidingof the first housing 11 and the second housing 12 by controlling slidingdirections of the first stretching member 31 and the second stretchingmember 32, and the flexible display 20 is controlled to be pulled out ofand retracted into the housing 10.

During the processes of the flexible display screen 20 being pulled outof and retracted into the housing 10, the transmission assembly 33 cancontrol the first stretching member 31 and the second stretching member32 to stop moving at any time, so the flexible display device can becontrolled to select any sizes between the initial display area and themaximum display area for display, which is more flexible.

The first support member 110 follows the first stretching member 31 tomove together along the stretching direction and drives the flexibledisplay screen 20 to be retracted into and pulled out of the housing 10.In order to make the first support member 110 always move in a samedirection as the stretching direction, it is necessary to provide alimit structure on the two first side plates 122.

In an embodiment, the two first side plates 122 are both defined withslots, and two opposite sides of the first support member 110 aremovably installed in the slots. Specifically, two opposite sides of thefirst support member 110 are provided with sliders. The sliders aredisposed in the slots and slide back and forth along a length directionof the slots. The slots extend along the stretching direction. In thisway, it can be ensured that the flexible display screen 20 outside thehousing 10 can be retracted into and pulled out of the housing 10. Whenthe user is viewing images on the flexible display screen 20, the screenwill not be tilted, ensuring a viewing effect.

FIG. 2 is an enlarged schematic diagram of a structure at A in FIG. 1 .FIG. 3 is a schematic diagram of the structure in FIG. 2 viewed fromanother angle. With reference to FIGS. 1, 2, and 3 , the transmissionassembly 30 includes a first transmission assembly and a secondtransmission assembly disposed on the inner walls of the two first sideplates 122. Both the first transmission assembly and the secondtransmission assembly include a circular gear 331, a first bevel gear332, a second bevel gear 333, and a screw 334. The first bevel gear 332is fixed on a side of the circular gear 331 and is coaxial with thecircular gear 331, and their rotation direction and rotation speed arethe same. The second bevel gear 333 meshes with the first bevel gear332, which means that the second bevel gear 333 and the first bevel gear332 have equal modules and form a gear pair. The second bevel gear 333is fixed on a first end of the screw 334. The screw 334 and the secondbevel gear 333 are coaxial, and their rotation direction and rotationspeed are the same.

In the first transmission assembly and the second transmission assembly,the circular gear 331 and the second bevel gear 333 are both fixed tothe inner wall of the first side plate 122 through a gear bracket 301. Asecond end of the screw 334 is fixed to the inner wall of the first sideplate 122 through a screw bracket 302. The gear bracket 301 supports thecircular gear 331, the first bevel gear 332, and the second bevel gear333, and indirectly provides support for the first end of the screw 334.The circular gear 331, the first bevel gear 332, and the second bevelgear 333 can all rotate freely along their own axes. The screw bracket302 supports the second end of the screw 334. The screw 334 can alsorotate freely along its own axis.

In an embodiment, the first stretching member 31 includes two gear racksfixed on a bottom surface of the first support member 110. The two gearracks are respectively adjacent to the two first side plates 122. Of thetwo gear racks, one meshes with the circular gear 331 in the firsttransmission assembly, and the other one meshes with the circular gear331 in the second transmission assembly, which means that the two racksand the two circular gears 331 respectively form gear pairs.

The second stretching member 32 includes a sliding plate 321 and sleeves322 disposed at two opposite ends of the sliding plate 321. The sleeves322 are respectively nested with the screw 334 in the first transmissionassembly and the screw 334 in the second transmission assembly. An innerwall of each sleeve 322 are provided with a protrusion (not shown), andthe protrusion fits a thread groove on the screw 334.

When the flexible display device is switched between the first state andthe second state, a rotation of the circular gear 331 drives the firststretching member 31 and the second stretching member 32 to move, and apower of the circular gear 331 comes from a driving mechanism (notshown) of the flexible display device.

When the flexible display screen 20 is in the first state, the drivingmechanism drives the circular gear 331 to rotate in a first direction.The circular gear 331 meshes with the gear rack to drive the firststretching member 31 to move in a direction away from the secondstretching member 32. Meanwhile, because the rotation direction androtation speed of the first bevel gear 332 and the circular gear 331 arethe same, the first bevel gear 332 drives the screw 334 to rotate bymeshing with the second bevel gear 333. Because the thread groove on thescrew 334 fits the groove on the inner wall of the sleeve 322, theprotrusion on the inner wall of the sleeve 322 can only slide in thethread groove. Therefore, when the screw 334 rotates, the sliding plate321 is pulled by the thread groove to slide in an opposite direction ofthe gear rack sliding, which means that the circular gear 331 drives thesecond stretching member 32 to move in a direction away from the firststretching member 31.

Similarly, When the flexible display screen 20 is in the second state,the driving mechanism drives the circular gear 331 to rotate in a seconddirection. The circular gear 331 meshes with the gear rack to drive thefirst stretching member 31 to move in a direction approaching the secondstretching member 32. Because the first bevel gear 332, the second bevelgear 333, and the screw 334 fit each other, the second stretching member32 is driven to move in a direction approaching the first stretchingmember 31. The first direction is one of clockwise or counterclockwise,and the second direction is the other one of clockwise orcounterclockwise.

The driving mechanism can be a motor or a reducer connected to thecircular gear 331. The circular gear 331 is driven by the motor or thereducer, so an entire motion system can be controlled by electricalsignals. The user only needs to transmit electrical signals to the motorthrough buttons to drive the entire motion system to operate, so thatthe flexible display device of the present application can be switchedbetween two display states of retraction and stretching.

In the flexible display device of the present application, when thetransmission assembly 33 drives the first stretching member 31 and thesecond stretching member 32 to move, moving distances and moving speedsof the first stretching member 31 and the second stretching member 32are equal. Specifically, the moving distance (speed) of the gear rackand the moving distance (speed) of the sliding plate 321 are alwaysequal in magnitude and opposite in direction by configuring a referencecircle diameter d1 of the circular gear 331, a reference circle diameterd2 of the first bevel gear 332, a reference circle diameter d3 of thesecond bevel gear 333, and a pitch L of the thread groove on the screw334.

In an embodiment, the above four satisfy an equation: d2*L=π*d1*d3Assuming that the moving distance of the gear rack is a, a rotationangle of the circular gear 331 meshing with the gear rack is α1, and thetwo satisfy α1=2a/d1. Because the first bevel gear 332 and the circulargear 331 are coaxial and fixed together, a rotation angle of the firstbevel gear 332 is also α1. The first bevel gear 332 meshes with thesecond bevel gear 333, and if the rotation angle of the second bevelgear 333 is α2, then d2*α1=d3*α2, and α2=d2*α1/d3. Also, the secondbevel gear 333 and the screw 334 are coaxial and fixed together, arotation angle of the screw 334 is also α2. If a pitch of the screw isL, a sliding distance of the sliding plate 321 is b, when the screw 334rotates one turn, the sliding distance of the sliding plate 321 is alsoL. Therefore, a distance that the screw 334 pushes the sliding plate 321to slide satisfies b=α2/2/π*L. Because it is necessary to meet a minimumpulling force on the flexible display screen 20 during the slidingprocess, a=b is configured, and d2*L=π*d1*d3 is obtained.

If the above equation is satisfied, when the flexible display screen 20is pulled out of the housing 10, a length of a portion of the flexibledisplay screen 20 pulled out of the housing 10 by the first stretchingmember 31 is equal to a length of a portion of flexible display screen20 pushed out of the housing 10 by the second stretching member 32, andspeeds of pulling out and pushing out are equal. Therefore, when theflexible display screen 20 is stretched outwards and retracted inward,it will not be greatly dragged, thereby forming a protective effect onthe flexible display screen 20 and extending the lifespan of theflexible display screen 20.

In an embodiment, the first stretching member 31 includes a first rackprovided on the bottom surface of the first support member 110. Thesecond stretching member 32 includes a second rack provided on a topsurface of the second support member 120. The transmission assembly 33includes a gear and a gear pin penetrating through a center hole of thegear. The gear pin is movably installed in a transmission groove, whichcan make the gear rotate clockwise or counterclockwise around its ownaxis. The gear meshes with the first rack and the second rack, whichmeans that modules of the gear, the first rack, and the second rack areall equal. Therefore, the first gear rack and the gear form a gear pair,and the second gear rack and the gear also form a gear pair.

When the flexible display device is switched between the first state andthe second state, a rotation of the gear drives the first stretchingmember 31 and the second stretching member 32 to move, and the power ofthe gear comes from a driving mechanism of the flexible display device.When the flexible display screen 20 is in the first state, the drivingmechanism drives the gear to rotate in the first direction. The gearmeshes with the first gear rack to drive the first stretching member 31to move in the direction away from the second stretching member 32 andmeshes with the second gear rack to drive the second stretching member32 to move in the direction away from the first stretching member 31.

When the flexible display screen 20 is in the second state, the drivingmechanism drives the gear to rotate in the second direction. The gearmeshes with the first gear rack to drive the first stretching member 31to move in the direction approaching the second stretching member 32 andmeshes with the second gear rack to drive the second stretching member32 to move in the direction approaching the first stretching member 31.The first direction is one of clockwise or counterclockwise, and thesecond direction is the other one of clockwise or counterclockwise.

The driving mechanism can be a motor or a reducer connected to the gear.The gear is driven by the motor or the reducer, so the entire motionsystem can be controlled by electrical signals. The user only needs totransmit electrical signals to the motor through buttons, and can drivethe entire motion system to operate, so that the flexible display deviceof the present application can be switched between two display states ofretraction and stretching.

Because the gear meshes with the first gear rack and the second gearrack, the moving distances and the moving speeds of the first stretchingmember 31 and the second stretching member 32 are always equal inmagnitude and opposite in direction. When the flexible display screen 20is pulled out of the housing 10, a length of a portion of the flexibledisplay screen 20 pulled out of the housing 10 by the first stretchingmember 31 is equal to a length of a portion of flexible display screen20 pushed out of the housing 10 by the second stretching member 32, andspeeds of pulling out and pushing out are equal. Therefore, when theflexible display screen 20 is stretched outwards and retracted inward,it will not be greatly dragged, thereby forming a protective effect onthe flexible display screen 20 and extending the lifespan of theflexible display screen 20.

The gear is movably installed in the transmission groove by the gearpin, and the first stretching member 31 and the second stretching member32 are driven to move in opposite directions through the rotation ofgear. In order to make movable distances of the first stretching member31 and the second stretching member 32 as long as possible, thetransmission groove is provided in a middle position on the inner wallof the first side plate 122, which means that the gear is positioned ina middle position of the flexible display device. A module of the gearranges from 0.25 millimeters to 5 millimeters.

The first gear rack is disposed on the bottom surface of the firstsupport member 110. The second gear rack is disposed on the top surfaceof the second support member 120. The gear in the transmission assembly33 rotate to drive the gear racks to move. There are many ways toarrange the first gear rack, the second gear rack, and the transmissionassembly 33.

In an embodiment, an entire surface of the first gear rack is disposedon the bottom surface of the first support member 110. An entire surfaceof the second gear rack is disposed on the top surface of the secondsupport member 120. The gear pin penetrates through two opposite ends ofthe gear and is movably installed in the transmission grooves on the twofirst side plates 122 respectively. A width of the gear is less than orequal to a distance between the two first side plates 122.

In an embodiment, the bottom surface of the first support member 110 isprovided with two first gear racks parallel to each other. The two firstracks are respectively adjacent to the two first side plates 122. Thetop surface of the second support member 120 is provided with two secondgear racks parallel to each other. The two second gear racks arerespectively adjacent to the two first side plates 122 and correspond tothe two first gear racks 310. The transmission assembly 33 includes afirst transmission assembly and a second transmission assembly, whichare separated from each other. The gear pin in the first transmissionassembly is movably installed in the transmission groove on one firstside plate 122. The gear pin in the second transmission assembly ismovably installed in the transmission groove on another first side plate122. The gear in the first transmission assembly meshes with the firstgear rack and the second gear rack adjacent to one first side plate 122.The gear in the second transmission assembly meshes with the first gearrack and the second gear rack adjacent to another first side plate 122.

In this embodiment, the flexible display screen 20 can be switchedbetween the first state and the second state through fitting the gear,the gear pin, the first gear rack, and the second gear rack. An entirestretching mechanism 30 has a simple structure and does not require toomuch complicated design. Therefore, the space occupied by the flexibledisplay device is small, which further makes the flexible display devicehave a smaller overall volume and more convenient to be carried.

It should be explained that the structure of the stretching mechanism 30is not limited to the above two embodiments. Other stretching mechanismsthat can switch the flexible display screen 20 between the first stateand the second state fall within a protection scope of embodiments ofthe present application.

The first end 21 of the flexible display screen 20 can be fixed to theupper surface of the first support member 110 by a first adhesive layer.Material of the first adhesive layer can be an optical adhesive. Thesecond end 22 of the flexible display screen 20 can be fixed to theupper or lower surface of the second stretching member 32 by a secondadhesive layer or a clamping member. Material of the second adhesivelayer can be an optical adhesive. The clamping member can be a splint.

In an embodiment, the flexible display device further includes a guidemember 50. Two ends of the guide member 50 are mounted on the innerwalls of the two second side plates 112. The guide member 50 isconfigured to provide direction guidance during the sliding process ofthe flexible display screen 20, so that the flexible display screen 20slides more smoothly. The guide member 50 can be fixedly installed ormovably installed on the inner walls of the two second side plates 112.In this embodiment, the guide member 50 is movably installed.

Because the first support member 110 and the second tensile member 32are fixed on a plane of the flexible display screen 20, in order toprevent the second packaging portion 42 of the flexible display screen20 from being perpendicular to edges of the first support member 110 andthe second stretching member 32 to be scratched, the guide member 50 isprovided on one side of the first support member 110. The flexibledisplay screen 20 sequentially bypasses the second support member 120and the guide member 50, so that the first end 21 and the second end 22of the flexible display screen 20 can be smoothly transferred.

In an embodiment, the guide member 50 is a roller. Two end surfaces ofthe roller are movably installed on the inner walls of the two firstside plates 122. Specifically, either the inner walls of the two firstside plates 122 or the two end surfaces of the roller are provided witha circular protrusion, while the other are defined with a circulargroove 51. The circular protrusion is embedded in the circular groove51. As shown in FIG. 1 , circular protrusions are provided on the innerwalls of the two first side plates 122, circular grooves 51 are definedon two opposite end surfaces of the roller, and the two circularprotrusions are clamped in the two circular grooves 51. It is alsopossible to defined circular grooves 51 on the inner walls of the twofirst side plates 122, provide circular protrusions on the two oppositeend surfaces of the roller, and clamp the two circular protrusions inthe two circular grooves 51. Both these configurations are possible.Centers of the circular protrusion and the circular groove 51 are on anaxis of the roller, so the roller can rotate around its own axis. Whenthe flexible display screen 20 is pulled out of and retracted into thehousing 10, the roller can rotate with a moving direction of theflexible display screen 20, so that the flexible display screen 20 hasless resistance when it stretches and is easier to be pulled. The bottomsurface of the flexible display screen 20 will not produce too muchfriction, which extends the lifespan of the flexible display device.

The first end 21 of the flexible display screen 20 is fixed to the uppersurface of the first support member 110. The second end 22 of theflexible display screen 20 is fixed to the second stretching member 32.When the flexible display screen 20 is gradually pulled out of thehousing 10, the flexible display screen 20 has a portion between thefirst support member 110 and the guide member 50 in addition to aportion wound on the guide member 50. Therefore, the second supportmember 120 needs to be provided to support the portion of the secondpackaging portion 42, so that a display surface of the flexible displayscreen 20 is relatively flat. In addition, when the flexible displayscreen 20 has a touch function, a support function of the second supportmember 120 can also ensure normal use of the touch function and preventthe flexible display screen 20 from being damaged by pokes duringtouching.

In order to ensure that the portion of the flexible display screen 20outside the housing 10 can be supported during a stretching process, ofthe first support member 110 and the second support member 123, an uppersurface of one is defined with a plurality of grooves 601 arranged atintervals, while a surface of the other one is provided with a pluralityof comb teeth 602 arranged at intervals. A length direction of thegrooves 601 is same as the stretching direction. Each of the comb teeth602 is correspondingly embedded in each of the grooves 601.

This embodiment takes the first support member 110 defined with grooves601 and the second support member 120 provided with comb teeth 602 as anexample. When the flexible display screen 20 is pulled out of thehousing 10 with a movement of the first support member 110, because thesecond support member 120 is fixed to the two first side plates 122 andremains stationary, the comb teeth 602 gradually move away from thegrooves 601 with sliding of the first support member 110, and a lengthof each of the comb teeth 602 correspondingly embedded in each of thegrooves 601 is gradually shortened. When the flexible display screen 20is retracted into the housing 10 with the sliding of the first supportmember 110, the comb teeth 602 gradually slide in a directionapproaching the grooves 601 with the movement of the first supportmember 110, and the length of each of the comb teeth 602 correspondinglyembedded in each of the grooves 601 is gradually increased. Therefore,during the movement of the first support member 110, the first supportmember 110 and the second support member 120 always have an overlappingarea, so that the portion of the flexible display screen 20 outside thehousing 10 is supported at any position.

In an embodiment, a length of each of the comb teeth 602 is less than orequal to a length of each of the grooves 601. In this way, when thedisplay area of the first support member 110 slides to the flexibledisplay screen 20 is the initial display area, the comb teeth 602 arecompletely embedded in the grooves 601 in their length direction. Thefirst support member 110 and the second support member 120 fit eachother without a large gap between the two. All parts are supported whenthe flexible display screen 20 is touched, so a touch effect isincreased. In addition, the length direction of the grooves 601 canprovide a limit to the stretching direction, so that the flexibledisplay screen 20 endures a uniform force during the stretching process.

In an embodiment, as shown in FIG. 12 , a cross-section of each of thegrooves 601 includes an inverted trapezoid, and a cross-section of eachof the comb teeth includes a regular trapezoid. A height of a topsurface of each of the comb teeth 602 is less than or equal to a heightof a top opening of each of the grooves 601. The cross-section of eachof the grooves 601 is an inverted trapezoid, which means that each ofthe grooves 601 is a dovetail groove. An area of a bottom surface ofeach of the grooves 601 is greater than an area of the top openingthereof. The top surface of each of the comb teeth 602 is positionedbelow or flush with the opening of each of the grooves 601, so the topopening of each of the grooves 601 can provide a limit in an up and downdirection when each of the comb teeth 602 is embedded in each of thegrooves 601. An entire comb teeth 602 cannot penetrate through theopenings of the grooves 601, so that the comb teeth 602 of the secondsupport member 120 can be prevented from lifting upward and scratchingthe flexible display screen 20.

It can be known from the above-mentioned embodiments:

The flexible display device provided by the present application includesthe housing, the flexible display screen, the stretching mechanism, andthe packaging member. The housing includes the first housing and thesecond housing, which are relatively slidably arranged. The firsthousing includes the first support member. The second housing includesthe second support member. The first end of the flexible display screenis connected to the first support member. The stretching mechanism isdisposed in the housing. The second end of the flexible display screenbypasses the second support member and is connected to the stretchingmechanism. The packaging member is disposed on at least one first sideplate of the second housing. The first packaging surface of thepackaging member covers at least a portion of the edge of the flexibledisplay screen. When the flexible display screen is in the first state,the first housing and the second housing slide in directions away fromeach other, and the stretching mechanism pulls at least a portion of theflexible display screen out of the housing. When the flexible displayscreen is in the second state, the first housing and the second housingslide in directions approaching each other, and the stretching mechanismretracts at least a portion of the flexible display screen into thehousing. In the present application, when the flexible display screen ispulled out and retracted into the housing, the packaging member packagesa gap between the second support member and the flexible display screen,which prevents the edge of the flexible display screen from being liftedor prevents dust particles from intruding into the bottom of theflexible display screen, thereby extending a lifespan of the flexibledisplay device.

In the above embodiments, the descriptions of the various embodimentsare different in emphases, for contents not described in detail, pleaserefer to related description of other embodiments.

The flexible display device provided by embodiments of the presentapplication are described in detail above, and the description ofembodiments above is only for helping to understand technical solutionsof the present application and its core idea. Understandably, for aperson of ordinary skill in the art can make various modifications ofthe technical solutions of the embodiments of the present applicationabove. However, it does not depart from the scope of the technicalsolutions of the embodiments of the present application.

What is claimed is:
 1. A flexible display device, comprising: a housingcomprising a first housing and a second housing, which are relativelyslidably arranged, wherein the first housing comprises a first supportmember, and the second housing comprises a second support member; aflexible display screen, wherein a first end of the flexible displayscreen is connected to the first support member; a stretching mechanismdisposed in the housing, wherein a second end of the flexible displayscreen bypasses the second support member and is connected to thestretching mechanism; and a packaging member disposed on at least onefirst side plate of the second housing, wherein a first packagingsurface of the packaging member covers at least a portion of an edge ofthe flexible display screen; wherein when the flexible display screen isin a first state, the first housing and the second housing slide indirections away from each other, and the stretching mechanism pulls atleast a portion of the flexible display screen out of the housing;wherein when the flexible display screen is in a second state, the firsthousing and the second housing slide in directions approaching eachother, and the stretching mechanism retracts at least a portion of theflexible display screen into the housing; and wherein the packagingmember comprises a first packaging portion and a second packagingportion, which are connected to each other, the first packaging portionis disposed on an outer wall of the first side plate, the secondpackaging portion is disposed on a top surface of the first side platethrough the first packaging surface, and a notch is defined at anintersection of the outer wall and the top surface of the first sideplate, and the first packaging portion is disposed in the notch.
 2. Theflexible display device according to claim 1, wherein a thickness of thefirst packaging portion is equal to a depth of the notch.
 3. Theflexible display device according to claim 1, wherein the packagingmember and the first side plate are formed separately.
 4. The flexibledisplay device according to claim 1, wherein a length of the packagingmember is greater than or equal to a length of the second supportmember.
 5. The flexible display device according to claim 1, wherein asecond side plate of the first housing comprises a side plate body and afirst extension portion, the side plate body is parallel to the firstside plate, the first extension portion covers the packaging member, thepackaging member comprises a second packaging surface away from a topsurface of the first side plate, and a first extension surface of thefirst extension portion is in contact with the second packaging surface.6. The flexible display device according to claim 5, wherein of thefirst extension surface and the second packaging surface, one is formedwith at least one protrusion, the other one is defined with at least onegroove, which has a same number as the protrusion, and the protrusionand the groove fit each other.
 7. The flexible display device accordingto claim 6, wherein a shape of the protrusion comprises at least one ofa semicircle, a triangle, or a rectangle.
 8. The flexible display deviceaccording to claim 5, wherein a first blocking member is furtherprovided between the first extension surface and the second packagingsurface, and the first blocking member comprises a brush or a foam. 9.The flexible display device according to claim 5, wherein the secondside plate further comprises a second extension portion, the secondextension portion is connected to and perpendicular to the firstextension portion, the side plate body, the first extension portion, andthe second extension portion form an accommodation cavity, and thepackaging member is embedded in the accommodation cavity.
 10. Theflexible display device according to claim 9, wherein the secondextension portion comprises a second extension surface adjacent to anupper surface the flexible display screen, and a distance between thesecond extension surface and the upper surface of the flexible displayscreen is less than or equal to 0.5 millimeters.
 11. The flexibledisplay device according to claim 9, wherein the second extensionportion comprises a second extension surface adjacent to an uppersurface the flexible display screen, a second blocking member is furtherprovided between the second extension surface and the upper surface ofthe flexible display screen, and the second blocking member comprises abrush or a foam.
 12. The flexible display device according to claim 1,wherein the first housing comprises a first bottom plate, the secondhousing comprises a second bottom plate, and a distance between a bottomsurface of the first bottom plate and a bottom surface of the secondbottom plate is less than 1.5 millimeters.
 13. The flexible displaydevice according to claim 1, wherein the first housing comprises a firstbottom plate, the second housing comprises a second bottom plate, and adistance between a bottom surface of the first bottom plate and a bottomsurface of the second bottom plate is less than 0.5 millimeters.
 14. Theflexible display device according to claim 1, wherein inner walls of twofirst side plates arranged oppositely in the second housing are definedwith sliding grooves, and two sides of the first support member aremovably disposed in the sliding grooves.
 15. The flexible display deviceaccording to claim 1, wherein of the first support member and the secondsupport member, a surface of one is defined with a plurality of groovesarranged at intervals, a surface of the other one is provided with aplurality of comb teeth arranged at intervals, and each of the pluralityof comb teeth is correspondingly embedded in each of the plurality ofgrooves.
 16. The flexible display device according to claim 15, whereina cross-section of each of the plurality of grooves comprises aninverted trapezoid, and a cross-section of each of the plurality of combteeth comprises a regular trapezoid.
 17. The flexible display deviceaccording to claim 1, wherein the flexible display device furthercomprises a guide member disposed in the housing, and a second end ofthe flexible display screen bypasses the guide member and is connectedto the stretching mechanism.
 18. The flexible display device accordingto claim 17, wherein the guide member comprises a roller, and innerwalls of two first side plates arranged oppositely in the second housingor two end surfaces of the roller are provided with a circularprotrusion, another one is defined with a circular groove, and thecircular protrusion is embedded in the circular groove.